Ventilation unit



FIG. 1 is a front perspective view of a ventilation unit according to the design.

FIG. 2 is a front elevation view of the ventilation unit.

FIG. 3 is a side elevation view of the ventilation unit; and,

FIG. 4 is a top plan view of the ventilation unit. 

CLAIM The ornamental design for a ventilation unit, as shown and described. 